Civilax - May 25, 2020. Since the intention of the more restrictive drift limit for higher occupancy buildings was to improve nonstructural performance using normal occupancy installations, it is recommended that a normal occupancy glazing design which has a drift capacity of 0.020 hsx be used in all circumstances. 0. Special structures, such as nuclear power plants, offshore structures and large dams, are beyond the scope of EN 1998. According to the seismographs and risk zoning maps, the country lies in a very high seismically active zone. The design of underground facilities to withstand seismic loading thus, has aspects that are very different from the seismic design of surface structures. Prepared for the. Seismic Terminology (For definitions of terms used in this resource page, see Glossary of Seismic Terminology ). Subsequent to the use of the selected ground motions in seismic response analysis, a simple procedure provides an estimate of the magnitude of any potential bias in the results of seismic response analyses, if ground motions were inadequately selected. Base Isolation: This seismic design strategy involves separating the building from the foundation and acts to absorb shock. agricultural buildings, etc., γ1 = 0.8. From: Construction and Building Materials, 2018, Zhishen Wu, ... Mohamed F.M. Session 3 - Fundamentals for MDOF Systems and Bridge Design If a component is deemed to be rigid (fundamental period of less than 0.06 seconds), no dynamic amplifications need to be considered. However, this will not eliminate or reduce damage to building contents. ASCE 7-05 Table 13.5-1 coefficients for architectural components, Table 1.5. Ž . Sd(T1) is the ordinate of the design spectrum at period T1. In an earthquake, unsound structures are more likely to collapse and cause damage. In the previous section, it was shown that FRP-retrofitting of existing RC bridge columns was applied successfully to prevent several deficiencies and guarantee the required recoverability and controllability. (2005) reported that the residual inclination tends to be large in severely damaged piers, and it also exists in many lightly damaged or even nondamaged piers. For roof φ = 1, for other storeys φ = 0.5. The period of the building will be lengthened and the building will "ride out" the shaking within a tolerable range. Yozo et al. Finally, it is shown that the application of the methodology results in a consistent computation of the seismic demand curve irrespective of the conditioning intensity measure adopted. FEMA P-749 / December 2010. The Fp force is primarily used for design anchorage and bracing of the component. Tall buildings cannot be base-isolated or they would overturn. zi, zj are the heights of the masses mi, mj above the level of application of the seismic action. 14.13. Usually, the longer the duration, the less acceleration the building can endure. It explains the basic mechanisms of earthquakes, generation of design basis ground motion, and fundamentals of structural dynamics; further, it delves into geotechnical aspects related to the earthquake design, analysis of multi degree-of-freedom systems, and seismic design of RC structures and steel … We will look at existing structures and new structures, masonry and concrete in particular. Chen et al. Seismic design of reinforced concrete buildings is performed by determining earthquake design forces for the anticipated seismic activity in the region, from the building code adopted by the local authority. Functional / Operational—Ensure Occupant Safety and Health, Secure / SafeSecure / Safe—Natural Hazards Mitigation, Secure / Safe—Provide Security for Building Occupants and Assets. (2005) investigated the overall performances of three different retrofitting schemes with five-test units. If the mass is uniformly distributed then the geometric center of the floor and the center of mass may coincide. R. Park, in Comprehensive Structural Integrity, 2003. The seismic design of tunnel structures is referred to the FHWA Technical Manual for Design and Construction of Road Tunnels Civil Elements. Resistance to lateral loads is provided by flexural and shearing actions in the beams and the columns. Pisa, March 2015 Seismic Design Philosophy Main Concepts Energy dissipation Ductility Capacity design Learning from Earthquakes Energy Dissipation 3 Ductility and Ductility Factors • Ductility is the ability of the system to undergo plastic deformation. The Fp forces are determined by the following equation: Fp = seismic design force centered at the component’s center of gravity and distributed relative to the component’s mass distribution, SDS = design earthquake spectral response acceleration at short period, Rp = component response modification factor, Z = height in structure at the point of attachment of the component, H = average roof height of the structure relative to the base elevation. Subhash C. Goel, Sutat Leelataviwat, in Stability and Ductility of Steel Structures (SDSS'97), 1998. This book focuses on the seismic design of Structures, Piping Systems and Components (SSC). The seismic design is carried out considering different design acceleration values, namely 0.0 g, 0.1 g, 0.3 g and 0.5 g, an importance class II, and a medium ductility class (EC8-1), corresponding to a behaviour factor q = 3.9 (EC8-1-5.2.2.2). The structures need to be designed and detailed so as to counteract, the internal forces induce due to the earth mass shaking in base of these structures. Damping is a rate at which natural vibration is absorbed. Dr.József Farkas, Dr.Károly Jármai, in Design and Optimization of Metal Structures, 2008, Combination of actions for seismic design situations, Gk is the characteristic value of a permanent action, ae is the characteristic value of seismic action, Qk is the characteristic value of variable action. As previously mentioned, building code requirements are primarily prescriptive and define seismic zones and minimum safety factors to "design to."
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